PDF malware analysis — malicious · 966c1c8083b13524

MALICIOUS

PDF

81.0 KB Created: 2021-09-23 01:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: f68a6b3f1c69474e97ecb7df6f655850 SHA-1: 1a9344816dfdbf06b8616c3bc5118cbce0ea570c SHA-256: 966c1c8083b13524d5d2bec54dce366819d5c6916109c98fb3337c82e49f8cd4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://catamma.ru/uplcv?utm_term=fifa+2018+apk+and+obb+file+download PDF link annotation
- https://wigs4less.net/nbloom/fckuploads/file/56700868232.pdfIn PDF document text
- http://centrons.com/uploaded/file/1790940701613730a4569b3.pdfIn PDF document text
- http://barsugo.com/ckfinder/userfiles/files/volemowu.pdfIn PDF document text
- https://askisan.com/upload/ckfinder/files/gapezivoz.pdfIn PDF document text
- http://cozycornerexpress.com/uploads/files/7440574352.pdfIn PDF document text
- http://bertrandetgastineaudesigners.com/userfiles/file/27333527401.pdfIn PDF document text
- https://fundreamz.com/ckfinder/userfiles/files/57454184799.pdfIn PDF document text
- http://hypotekaprezamestnancov.sk/res/file/xitaxumufajexegezara.pdfIn PDF document text
- https://temporar.mirceaseminee.ro/printuri-fi/files/11323716599.pdfIn PDF document text
- https://lentes123.com/aym_image/files/84540770541.pdfIn PDF document text
- https://newegys.egyseg.eu/ckfinder/userfiles/files/guxipofuzuvotabogu.pdfIn PDF document text
- https://museuminiaturesbesalu.com/files/xizudikilizog.pdfIn PDF document text
- https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/108a889da52ee05247ef04d443a754f4/84476882803.pdfIn PDF document text
- https://limsurdua.com/contents/files/banozura.pdfIn PDF document text
- http://mutamobilya.com/images_upload/files/7653613963.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614715fc6854e---kisodigowaje.pdfIn PDF document text
- http://amdind.com/userfiles/file/migamutusor.pdfIn PDF document text
- http://sjhtractor.com/d/files/tidugutoboposepariri.pdfIn PDF document text
- https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/00n9b098igmednuoemfc5qm7cc/jovadesaxoridokivujexiki.pdfIn PDF document text
- http://rogersdesignhouse.com/uploads/files/8578497594.pdfIn PDF document text
- http://dayuntang.com/assets/uploads/ckedit/files/20210904180341.pdfIn PDF document text
- http://vinhthuan.asia/upload/files/4555210007.pdfIn PDF document text
- http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ee5ece5f5---kuvenarojiranazopiwoloza.pdfIn PDF document text
- https://alasclub.gr/neuro/ckfinder/userfiles/files/11086621740.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d838.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD838	17616 bytes
SHA-256: `8ce0d6f26e3fa95e8ca8566ea8cd078b90de01a6d1b9b2084269a1a1f534f776`
`font_01_sfnt_off0001051e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1051E	10920 bytes
SHA-256: `3914d10e21ae45adfd6efe27e8a27b6eda157cb82a2a9445db767c1bdf0bf8af`
`font_02_sfnt_off00011e61.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E61	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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